| abstract |
A golf ball 2 includes a core 4 , an envelope layer 6 positioned outside the core 4 , a mid layer 8 positioned outside the envelope layer 6 , and a cover 10 positioned outside the mid layer 8 . The core 4 includes a spherical center 12 and a core outer layer 14 positioned outside the center 12 . The center 12 has a diameter of 1 mm or greater and 15 mm or less. The difference (H4−H3) between the JIS-C hardness H4 of the core 4 at its surface and the JIS-C hardness H3 of the core outer layer 14 at its innermost portion is equal to or greater than 10. The cover 10 has a Shore D hardness H7 less than 40. The Shore D hardnesses H5, H6 and H7 of the envelope layer 6 , the mid layer 8 , and the cover 10 satisfy that H5>H6≧H7. |